1
00:00:00,420 --> 00:00:01,870
‫I know I know what you're thinking.

2
00:00:01,890 --> 00:00:07,800
‫You're really chomping at the bit to get this subletting, but before we talk about it, it's better

3
00:00:07,800 --> 00:00:11,910
‫to learn the IP classes and the subnet masks first.

4
00:00:12,090 --> 00:00:12,390
‫Right?

5
00:00:14,200 --> 00:00:21,040
‫Octet of the IP address are broken down to provide an addressing scheme that can accommodate large and

6
00:00:21,040 --> 00:00:22,000
‫small networks.

7
00:00:22,510 --> 00:00:26,980
‫So they're basically five different classes of networks, and they range from A to E.

8
00:00:29,160 --> 00:00:36,270
‫We're going to focus on classes A, B and C, which provide unique cast addresses for networks of three

9
00:00:36,270 --> 00:00:37,650
‫different network sizes.

10
00:00:38,370 --> 00:00:45,930
‫Class D is for multicast networking and the Class C address ranges reserved for future or experimental

11
00:00:45,930 --> 00:00:46,530
‫purposes.

12
00:00:48,170 --> 00:00:54,740
‫So given an IP address, its class can be determined from the three high order bits.

13
00:00:54,770 --> 00:00:59,570
‫And by that, I mean the three leftmost bit in the first octet.

14
00:01:00,530 --> 00:01:04,370
‫In a class I address, the first octet is a network portion.

15
00:01:05,210 --> 00:01:14,570
‫So Class AA has a major network address of one dot zero zero zero all the way through one to seven Dot

16
00:01:14,570 --> 00:01:17,300
‫255.255.255.0.

17
00:01:19,410 --> 00:01:25,830
‫The next 24 bits are for the network manager to divide in subnets and hosts as he or she sees fit.

18
00:01:27,760 --> 00:01:33,970
‫Class addresses are used for networks that have more than 65000 536 hosts.

19
00:01:35,020 --> 00:01:40,060
‫In a Class B address, the first two octet are the network portion.

20
00:01:40,660 --> 00:01:47,770
‫So Class B has a major network address of one two eight zero zero zero all the way through one nine

21
00:01:47,770 --> 00:01:51,070
‫one 255.255.255.0.

22
00:01:52,050 --> 00:01:53,280
‫Arquette's three and four.

23
00:01:53,610 --> 00:01:57,210
‫That means 16 bit are for a local subnets and hosts.

24
00:01:58,760 --> 00:02:06,500
‫Class B addresses are used for networks that have between 256 and 65000 534 hosts.

25
00:02:07,780 --> 00:02:12,460
‫And finally, in a Class C address, the first three octet are the network portion.

26
00:02:14,440 --> 00:02:21,490
‫Class C has a major network address of one nine two zero zero zero all the way through two to three

27
00:02:21,490 --> 00:02:32,230
‫Dot 255.255.255.0 Octet for eight bits is for local subnets and hosts perfect for networks with less

28
00:02:32,230 --> 00:02:34,750
‫than 250 for hosts.